CVE-2025-8679
CVE-2025-8679 is a critical-severity vulnerability in Extremenetworks Extremeguest Essentials with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-307.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v4: 7.6
- EPSS exploit prediction: 0% (24th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-32714
- Weakness: CWE-307
- Affected product: Extremenetworks Extremeguest Essentials
- Published:
- Last modified:
Description
In ExtremeGuest Essentials before 25.5.0, captive-portal may permit unauthorized access via manual brute-force procedure. Under certain ExtremeGuest Essentials captive-portal SSID configurations, repeated manual login attempts may allow an unauthenticated device to be marked as authenticated and obtain network access. Client360 logs may display the client MAC as the username despite no MAC-authentication being enabled.
Frequently asked questions
- What is CVE-2025-8679?
- In ExtremeGuest Essentials before 25.5.0, captive-portal may permit unauthorized access via manual brute-force procedure. Under certain ExtremeGuest Essentials captive-portal SSID configurations, repeated manual login attempts may allow an unauthenticated device to be marked as authenticated and obtain network access. Client360 logs may display the client MAC as the username despite no MAC-authentication being enabled.
- How severe is CVE-2025-8679?
- CVE-2025-8679 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2025-8679 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-8679?
- CVE-2025-8679 affects Extremenetworks Extremeguest Essentials. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-8679?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2025-8679 have an EU (EUVD) identifier?
- Yes. CVE-2025-8679 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-32714.
- When was CVE-2025-8679 published?
- CVE-2025-8679 was published on 2025-10-01 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:extremenetworks:extremeguest_essentials:*:*:*:*:*:*:*:*
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